Hydraulic jack for vehicles



A ril 26, 1938. J. DE COLA ET AL.

HYDRAULIC JACK FOR VEHICLES Filed Feb. 1, 1937 4 20 fag IN VE/V TORS. Jam 05 50M. MR5 Cflms TEA/5.5M

#TTOR/ViX Patented Apr. 26, 1938 HYDRAULIC .mcx FOB VEHICLES John De Cola, Wilmington, and Lars Christensen Beach, Calif.

Application February 1, i937, Serial No. 123,378

4 Claims.

This invention relates to 'a hydraulic jack for vehicles whereby either the front or rear end of the vehicle can be raised for the purpose of re-' moving tires or repairing the wheels of the vehicle.

An object of our invention is to provide a hydraulic jack which is so attached to the vehicle that said vehicle is stable when either end is elevated by the jack, that is, the vehicle will not tilt from side to side.

Another object of our invention is to provide a hydraulic jack of the character stated with two hydraulic rams, the rams being pivotally mounted in spaced relation to each other and both rams simultaneously acting upon the ground-engaging I shoe.

Another object of our invention is to provide a hydraulic jack of the character stated which can be easily attached to any motor vehicle, and which is operable by a manually actuated pump from the seat of the vehicle.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

Figure 1 is a fragmentary diagrammatical view of the vehicle with our hydraulic lack in position on the front axle thereof.

Figure 2 is a side elevation of our jack with parts broken away to show interior construction.

Figure 3 is aside elevation of the pump.

. Figure4 is a plan view of the four-way control valve.

Referring more particularly to the drawing, a housing I is rigidly attached to either the front or rear axles of the vehicle. It is understood that a jack is to be attached to both the front and'rear axles of the vehicles. We have only illustrated attachment to the front axle 2 as shown in Figure 1 of the ,drawing. The housing I, may be bolted, welded, or otherwise flxedly attached to the axle. The houslng l is preferably a channel construction and supports a pair of hydraulicallc rams (3-4). These rams are each plvotally attached to the housing i at the outer ends thereof as shown at 5-6. The hydraulic rams are identical in construction and each consists of an inner cylinder 1 and an outer sleeve 8 which is radially spaced from the cylinder.

A piston 9 is provided in the cylinder and a piston. rod it extends from thepiston and proiects out ofthe cylinder. The two piston rods II are plvotally attached together by the pin ii,

a ground-engaging shoe I2 is linked to the piston rods l by the pi oted links IS. The links l3 serve to keep the shoe'Tl. substantially horizontal so as to properly engage the ground.

In order that the rains 34 may operate simultaneously, and also, that the piston rods |0|0 shall be moved at a uniform rate of speed, we provide a guiding means on each of the rams which includes a cross-head M which projects outwardly from the piston rod and extends 10 through suitable longitudinal slots iS-IG in the cylinder and sleeve, respectively.

A pair of bifurcated couplings l'i-il are pivotally attached to the pin it. A pair of rods I 8 are attached to each of the couplings l'I--ii and extends to the cross-head I4. These rods are also journaled on the cross-head. A coil spring I9 bears against the cross-head I l and tends to retract the pistons -9 and thereby elevates the shoe I. It will be evident that when a fluid under pressure is introduced into the cylinders I, that the pistons 9 and piston rods in will be simultaneously urged outwardly whereupon the shoe I! will be pressed downwardly against the ground, thus, the vehicle.

A manually operable pump 20 is mounted on the dash of the vehicle. This pump is of the usual well-known plunger-type and is actuated by the push-rod 2|. The pump'forces the fluid under pressure to the the four-way valve 22 and by adjusting this valve the fluid can be directed to the lines 23 or 24 to the front or rear jacks as desired. The fluid, under pressure, enters the hydraulic rams simultaneously, as is evident from the pipe arrangement shown in Figure 2.

Having described our invention, we claim: 1. A hydraulic jack for vehicles comprising a housing adapted to be fixedly attached to an axle of the vehicle, a pair of rams pivotally mounted in the housing in spaced relation to each other, a piston rod projecting from each of the rams, said" piston rods being plvotally secured together and a shoe attached to said piston rods.

2. A hydraulic jack for vehicles comprising a housing adapted to be fixedly attached to an axle of the vehicle, a pair of. rams plvotally mounted in the housing in spaced relation to each other, a piston rod projecting from each of the rams,

said piston rods being plvotally secured together and a shoe attached to said piston rods, and

guide means on each of the rams.

3.'A hydraulic jack for vehicles comprising a housing, a pair of rams pivotally mounted in the housing at each end thereof, a piston rod proelevating the front or rear end of 25 iecting from each of the ram, said piston nods,

. being pivotaliy secured together, a shoe, vlink means extending from the shoe to the pivot 01 thepiston rods, 9. pair of couplings pivotaliymounted on the pivot for the piston rods. a cross head in each oi the ram. and connecting rods pivotaily attached to said couplings and to'the cross head.

4. A hydraulic jack for vehicles comprising a housing adapted to be'iiiledly attached to an axle of the vehicle, a pair of ram mounted to the housing and spaced relation to each other, a piston rod projecting from each of'the rains, said piston rods being pivotally connected. and a shoe 5 attached to said piston rods.

' JOHN DE COLA.

Lana CHRISTENSEN. 

